ABSTRACT
Our discussion so far has implicitly assumed the use of conventional print media for presenting instructional diagrams. While the general principles we have discussed are applicable to a range of instructional media, some media have special characteristics that can either enhance or restrict the possibilities for diagram design. For example, a book can show much finer detail in a diagram than can be shown on a video screen. However, a book relies on a static presentation of the subject matter whereas a diagram on video can be animated.
